C语言------嵌套函数（求某年某月的天数）

#include<cstdio>
#include<iostream>
using namespace std;


int is_year(int year)
{
	if ((year % 4 == 0) && (year % 100 != 0) || (year % 400 == 0))
	{
		return true;
	}
	else
	{
		return false;
	}
}


int get_day_of_month(int year, int month)
{
	int   day[13] = { 0,31,28,31,30,31,30,31,31,30,31,30,31 };
	int   days = day[month];
	if (is_year(year) && month == 2)
	{
		days += 1;
	}
	return days;
}
int main()
{
	int year = 0;
	int month = 0;
	cin >> year >> month;
	int day = get_day_of_month(year, month);
	printf("%d", day);
	return 0;
}